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Merge tag 'topic/nouveau-i915-dp-helpers-and-cleanup-2020-08-31-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

Browse Source 
UAPI Changes:

None

Cross-subsystem Changes:

* Moves a bunch of miscellaneous DP code from the i915 driver into a set
  of shared DRM DP helpers

Core Changes:

* New DRM DP helpers (see above)

Driver Changes:

* Implements usage of the aforementioned DP helpers in the nouveau
  driver, along with some other various HPD related cleanup for nouveau

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/11e59ebdea7ee4f46803a21fe9b21443d2b9c401.camel@redhat.com
This commit is contained in:
Dave Airlie
2020-09-09 12:27:12 +10:00
parent 1f4b2aca79 79416e97dd
commit 877d8c0743
33 changed files with 864 additions and 422 deletions
Download Patch File Download Diff File Expand all files Collapse all files

187
drivers/gpu/drm/drm_dp_helper.c
View File

@@ -423,6 +423,133 @@ bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux,
}
EXPORT_SYMBOL(drm_dp_send_real_edid_checksum);
static u8 drm_dp_downstream_port_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
u8 port_count = dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_PORT_COUNT_MASK;
if (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE && port_count > 4)
port_count = 4;
return port_count;
}
static int drm_dp_read_extended_dpcd_caps(struct drm_dp_aux *aux,
u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
u8 dpcd_ext[6];
int ret;
/*
* Prior to DP1.3 the bit represented by
* DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT was reserved.
* If it is set DP_DPCD_REV at 0000h could be at a value less than
* the true capability of the panel. The only way to check is to
* then compare 0000h and 2200h.
*/
if (!(dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT))
return 0;
ret = drm_dp_dpcd_read(aux, DP_DP13_DPCD_REV, &dpcd_ext,
sizeof(dpcd_ext));
if (ret < 0)
return ret;
if (ret != sizeof(dpcd_ext))
return -EIO;
if (dpcd[DP_DPCD_REV] > dpcd_ext[DP_DPCD_REV]) {
DRM_DEBUG_KMS("%s: Extended DPCD rev less than base DPCD rev (%d > %d)\n",
aux->name, dpcd[DP_DPCD_REV],
dpcd_ext[DP_DPCD_REV]);
return 0;
}
if (!memcmp(dpcd, dpcd_ext, sizeof(dpcd_ext)))
return 0;
DRM_DEBUG_KMS("%s: Base DPCD: %*ph\n",
aux->name, DP_RECEIVER_CAP_SIZE, dpcd);
memcpy(dpcd, dpcd_ext, sizeof(dpcd_ext));
return 0;
}
/**
* drm_dp_read_dpcd_caps() - read DPCD caps and extended DPCD caps if
* available
* @aux: DisplayPort AUX channel
* @dpcd: Buffer to store the resulting DPCD in
*
* Attempts to read the base DPCD caps for @aux. Additionally, this function
* checks for and reads the extended DPRX caps (%DP_DP13_DPCD_REV) if
* present.
*
* Returns: %0 if the DPCD was read successfully, negative error code
* otherwise.
*/
int drm_dp_read_dpcd_caps(struct drm_dp_aux *aux,
u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
int ret;
ret = drm_dp_dpcd_read(aux, DP_DPCD_REV, dpcd, DP_RECEIVER_CAP_SIZE);
if (ret < 0)
return ret;
if (ret != DP_RECEIVER_CAP_SIZE || dpcd[DP_DPCD_REV] == 0)
return -EIO;
ret = drm_dp_read_extended_dpcd_caps(aux, dpcd);
if (ret < 0)
return ret;
DRM_DEBUG_KMS("%s: DPCD: %*ph\n",
aux->name, DP_RECEIVER_CAP_SIZE, dpcd);
return ret;
}
EXPORT_SYMBOL(drm_dp_read_dpcd_caps);
/**
* drm_dp_read_downstream_info() - read DPCD downstream port info if available
* @aux: DisplayPort AUX channel
* @dpcd: A cached copy of the port's DPCD
* @downstream_ports: buffer to store the downstream port info in
*
* See also:
* drm_dp_downstream_max_clock()
* drm_dp_downstream_max_bpc()
*
* Returns: 0 if either the downstream port info was read successfully or
* there was no downstream info to read, or a negative error code otherwise.
*/
int drm_dp_read_downstream_info(struct drm_dp_aux *aux,
const u8 dpcd[DP_RECEIVER_CAP_SIZE],
u8 downstream_ports[DP_MAX_DOWNSTREAM_PORTS])
{
int ret;
u8 len;
memset(downstream_ports, 0, DP_MAX_DOWNSTREAM_PORTS);
/* No downstream info to read */
if (!drm_dp_is_branch(dpcd) ||
dpcd[DP_DPCD_REV] < DP_DPCD_REV_10 ||
!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
return 0;
len = drm_dp_downstream_port_count(dpcd);
if (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE)
len *= 4;
ret = drm_dp_dpcd_read(aux, DP_DOWNSTREAM_PORT_0, downstream_ports, len);
if (ret < 0)
return ret;
return ret == len ? 0 : -EIO;
}
EXPORT_SYMBOL(drm_dp_read_downstream_info);
/**
* drm_dp_downstream_max_clock() - extract branch device max
* pixel rate for legacy VGA
@@ -431,7 +558,11 @@ EXPORT_SYMBOL(drm_dp_send_real_edid_checksum);
* @dpcd: DisplayPort configuration data
* @port_cap: port capabilities
*
* Returns max clock in kHz on success or 0 if max clock not defined
* See also:
* drm_dp_read_downstream_info()
* drm_dp_downstream_max_bpc()
*
* Returns: Max clock in kHz on success or 0 if max clock not defined
*/
int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
const u8 port_cap[4])
@@ -462,7 +593,11 @@ EXPORT_SYMBOL(drm_dp_downstream_max_clock);
* @dpcd: DisplayPort configuration data
* @port_cap: port capabilities
*
* Returns max bpc on success or 0 if max bpc not defined
* See also:
* drm_dp_read_downstream_info()
* drm_dp_downstream_max_clock()
*
* Returns: Max bpc on success or 0 if max bpc not defined
*/
int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
const u8 port_cap[4])
@@ -668,6 +803,54 @@ void drm_dp_set_subconnector_property(struct drm_connector *connector,
}
EXPORT_SYMBOL(drm_dp_set_subconnector_property);
/**
* drm_dp_read_sink_count_cap() - Check whether a given connector has a valid sink
* count
* @connector: The DRM connector to check
* @dpcd: A cached copy of the connector's DPCD RX capabilities
* @desc: A cached copy of the connector's DP descriptor
*
* See also: drm_dp_read_sink_count()
*
* Returns: %True if the (e)DP connector has a valid sink count that should
* be probed, %false otherwise.
*/
bool drm_dp_read_sink_count_cap(struct drm_connector *connector,
const u8 dpcd[DP_RECEIVER_CAP_SIZE],
const struct drm_dp_desc *desc)
{
/* Some eDP panels don't set a valid value for the sink count */
return connector->connector_type != DRM_MODE_CONNECTOR_eDP &&
dpcd[DP_DPCD_REV] >= DP_DPCD_REV_11 &&
dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT &&
!drm_dp_has_quirk(desc, 0, DP_DPCD_QUIRK_NO_SINK_COUNT);
}
EXPORT_SYMBOL(drm_dp_read_sink_count_cap);
/**
* drm_dp_read_sink_count() - Retrieve the sink count for a given sink
* @aux: The DP AUX channel to use
*
* See also: drm_dp_read_sink_count_cap()
*
* Returns: The current sink count reported by @aux, or a negative error code
* otherwise.
*/
int drm_dp_read_sink_count(struct drm_dp_aux *aux)
{
u8 count;
int ret;
ret = drm_dp_dpcd_readb(aux, DP_SINK_COUNT, &count);
if (ret < 0)
return ret;
if (ret != 1)
return -EIO;
return DP_GET_SINK_COUNT(count);
}
EXPORT_SYMBOL(drm_dp_read_sink_count);
/*
* I2C-over-AUX implementation
*/